DataSheet:

555 is a very commonly used IC for generating accurate timing pulses. It is an 8pin timer IC and has mainly two modes of operation: monostable and astable. In monostable mode time delay of the pulses can be precisely controlled by an external resistor and a capacitor whereas in astable mode the frequency & duty cycle are controlled by two external resistors and a capacitor. 555 is very commonly used for generating time delays and pulses.

Pin Diagram:

Pin Description:

Pin No

Function

Name

1

Ground (0V)

Ground

2

Voltage below 1/3 Vcc to trigger the pulse

Trigger

3

Pulsating output

Output

4

Active low; interrupts the timing interval at Output

Reset

5

Provides access to the internal voltage divider; default 2/3 Vcc

Control Voltage

6

The pulse ends when the voltage is greater than Control

Threshold

7

Open collector output; to discharge the capacitor

Discharge

8

Supply voltage; 5V (4.5V - 16 V)

Vcc

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